src/assembly/alpha/assem-rtns.lisp

   1 ;;;; This software is part of the SBCL system. See the README file for
   2 ;;;; more information.
   3 ;;;;
   4 ;;;; This software is derived from the CMU CL system, which was
   5 ;;;; written at Carnegie Mellon University and released into the
   6 ;;;; public domain. The software is in the public domain and is
   7 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
   8 ;;;; files for more information.
   9
  10 (in-package "SB!VM")
  11 \f
  12 ;;;; Return-multiple with other than one value
  13
  14 #+sb-assembling ;; We don't want a vop for this one.
  15 (define-assembly-routine
  16     (return-multiple
  17      (:return-style :none))
  18
  19      ;; These four are really arguments.
  20     ((:temp nvals any-reg nargs-offset)
  21      (:temp vals any-reg nl0-offset)
  22      (:temp ocfp any-reg nl1-offset)
  23      (:temp lra descriptor-reg lra-offset)
  24
  25      ;; These are just needed to facilitate the transfer
  26      (:temp lip interior-reg lip-offset)
  27      (:temp count any-reg nl2-offset)
  28      (:temp dst any-reg nl4-offset)
  29      (:temp temp descriptor-reg l0-offset)
  30
  31      ;; These are needed so we can get at the register args.
  32      (:temp a0 descriptor-reg a0-offset)
  33      (:temp a1 descriptor-reg a1-offset)
  34      (:temp a2 descriptor-reg a2-offset)
  35      (:temp a3 descriptor-reg a3-offset)
  36      (:temp a4 descriptor-reg a4-offset)
  37      (:temp a5 descriptor-reg a5-offset))
  38
  39   ;; Note, because of the way the RETURN-MULTIPLE VOP is written, we
  40   ;; can assume that we are never called with NVALS == 1 and that A0
  41   ;; has already been loaded.
  42   (inst ble nvals default-a0-and-on)
  43   (inst ldl a1 (* 1 n-word-bytes) vals)
  44   (inst subq nvals (fixnumize 2) count)
  45   (inst ble count default-a2-and-on)
  46   (inst ldl a2 (* 2 n-word-bytes) vals)
  47   (inst subq nvals (fixnumize 3) count)
  48   (inst ble count default-a3-and-on)
  49   (inst ldl a3 (* 3 n-word-bytes) vals)
  50   (inst subq nvals (fixnumize 4) count)
  51   (inst ble count default-a4-and-on)
  52   (inst ldl a4 (* 4 n-word-bytes) vals)
  53   (inst subq nvals (fixnumize 5) count)
  54   (inst ble count default-a5-and-on)
  55   (inst ldl a5 (* 5 n-word-bytes) vals)
  56   (inst subq nvals (fixnumize 6) count)
  57   (inst ble count done)
  58
  59   ;; Copy the remaining args to the top of the stack.
  60   (inst addq vals (* 6 n-word-bytes) vals)
  61   (inst addq cfp-tn (* 6 n-word-bytes) dst)
  62
  63   LOOP
  64   (inst ldl temp 0 vals)
  65   (inst addq vals n-word-bytes vals)
  66   (inst stl temp 0 dst)
  67   (inst subq count (fixnumize 1) count)
  68   (inst addq dst n-word-bytes dst)
  69   (inst bne count loop)
  70
  71   (inst br zero-tn done)
  72
  73   DEFAULT-A0-AND-ON
  74   (inst move null-tn a0)
  75   (inst move null-tn a1)
  76   DEFAULT-A2-AND-ON
  77   (inst move null-tn a2)
  78   DEFAULT-A3-AND-ON
  79   (inst move null-tn a3)
  80   DEFAULT-A4-AND-ON
  81   (inst move null-tn a4)
  82   DEFAULT-A5-AND-ON
  83   (inst move null-tn a5)
  84   DONE
  85
  86   ;; Clear the stack.
  87   (move cfp-tn ocfp-tn)
  88   (move ocfp cfp-tn)
  89   (inst addq ocfp-tn nvals csp-tn)
  90
  91   ;; Return.
  92   (lisp-return lra lip))
  93 \f
  94 ;;;; tail-call-variable
  95
  96 #+sb-assembling ;; no vop for this one either
  97 (define-assembly-routine
  98     (tail-call-variable
  99      (:return-style :none))
 100
 101     ;; These are really args.
 102     ((:temp args any-reg nl0-offset)
 103      (:temp lexenv descriptor-reg lexenv-offset)
 104
 105      ;; We need to compute this
 106      (:temp nargs any-reg nargs-offset)
 107
 108      ;; These are needed by the blitting code.
 109      (:temp src any-reg nl1-offset)
 110      (:temp dst any-reg nl2-offset)
 111      (:temp count any-reg cfunc-offset)
 112      (:temp temp descriptor-reg l0-offset)
 113
 114      ;; Needed for the jump
 115      (:temp lip interior-reg lip-offset)
 116
 117      ;; These are needed so we can get at the register args.
 118      (:temp a0 descriptor-reg a0-offset)
 119      (:temp a1 descriptor-reg a1-offset)
 120      (:temp a2 descriptor-reg a2-offset)
 121      (:temp a3 descriptor-reg a3-offset)
 122      (:temp a4 descriptor-reg a4-offset)
 123      (:temp a5 descriptor-reg a5-offset))
 124
 125
 126   ;; Calculate NARGS (as a fixnum)
 127   (inst subq csp-tn args nargs)
 128
 129   ;; Load the argument regs (must do this now, 'cause the blt might
 130   ;; trash these locations)
 131   (inst ldl a0 (* 0 n-word-bytes) args)
 132   (inst ldl a1 (* 1 n-word-bytes) args)
 133   (inst ldl a2 (* 2 n-word-bytes) args)
 134   (inst ldl a3 (* 3 n-word-bytes) args)
 135   (inst ldl a4 (* 4 n-word-bytes) args)
 136   (inst ldl a5 (* 5 n-word-bytes) args)
 137
 138   ;; Calc SRC, DST, and COUNT
 139   (inst subq nargs (fixnumize register-arg-count) count)
 140   (inst addq args (* n-word-bytes register-arg-count) src)
 141   (inst ble count done)
 142   (inst addq cfp-tn (* n-word-bytes register-arg-count) dst)
 143
 144   LOOP
 145   ;; Copy one arg.
 146   (inst ldl temp 0 src)
 147   (inst addq src n-word-bytes src)
 148   (inst stl temp 0 dst)
 149   (inst subq count (fixnumize 1) count)
 150   (inst addq dst n-word-bytes dst)
 151   (inst bgt count loop)
 152
 153   DONE
 154   ;; We are done.  Do the jump.
 155   (progn
 156     (loadw temp lexenv closure-fun-slot fun-pointer-lowtag)
 157     (lisp-jump temp lip)))
 158
 159 \f
 160 ;;;; non-local exit noise
 161
 162 (define-assembly-routine
 163     (unwind
 164      (:translate %continue-unwind)
 165      (:policy :fast-safe))
 166     ((:arg block (any-reg descriptor-reg) a0-offset)
 167      (:arg start (any-reg descriptor-reg) ocfp-offset)
 168      (:arg count (any-reg descriptor-reg) nargs-offset)
 169      (:temp lip interior-reg lip-offset)
 170      (:temp lra descriptor-reg lra-offset)
 171      (:temp cur-uwp any-reg nl0-offset)
 172      (:temp next-uwp any-reg nl1-offset)
 173      (:temp target-uwp any-reg nl2-offset)
 174      (:temp temp1 non-descriptor-reg nl3-offset))
 175   (declare (ignore start count))
 176
 177   (load-symbol-value cur-uwp *current-unwind-protect-block*)
 178   (let ((error (generate-error-code nil invalid-unwind-error)))
 179     (inst beq block error))
 180
 181   (loadw target-uwp block unwind-block-current-uwp-slot)
 182   (inst cmpeq cur-uwp target-uwp temp1)
 183   (inst beq temp1 do-uwp)
 184
 185   (move block cur-uwp)
 186
 187   do-exit
 188
 189   (loadw cfp-tn cur-uwp unwind-block-current-cont-slot)
 190   (loadw code-tn cur-uwp unwind-block-current-code-slot)
 191   (progn
 192     (loadw lra cur-uwp unwind-block-entry-pc-slot)
 193     (lisp-return lra lip :frob-code nil))
 194
 195   do-uwp
 196
 197   (loadw next-uwp cur-uwp unwind-block-current-uwp-slot)
 198   (store-symbol-value next-uwp *current-unwind-protect-block*)
 199   (inst br zero-tn do-exit))
 200
 201 (define-assembly-routine
 202     throw
 203     ((:arg target descriptor-reg a0-offset)
 204      (:arg start any-reg ocfp-offset)
 205      (:arg count any-reg nargs-offset)
 206      (:temp catch any-reg a1-offset)
 207      (:temp tag descriptor-reg a2-offset)
 208      (:temp temp1 non-descriptor-reg nl0-offset))
 209
 210   (progn start count) ; We just need them in the registers.
 211
 212   (load-symbol-value catch *current-catch-block*)
 213
 214   loop
 215
 216   (let ((error (generate-error-code nil unseen-throw-tag-error target)))
 217     (inst beq catch error))
 218
 219   (loadw tag catch catch-block-tag-slot)
 220   (inst cmpeq tag target temp1)
 221   (inst bne temp1 exit)
 222   (loadw catch catch catch-block-previous-catch-slot)
 223   (inst br zero-tn loop)
 224
 225   exit
 226
 227   (move catch target)
 228   (inst li (make-fixup 'unwind :assembly-routine) temp1)
 229   (inst jmp zero-tn temp1 (make-fixup 'unwind :assembly-routine)))